Mesophilic anaerobic digestion of food waste: Effect of thermal pretreatment on improvement of anaerobic digestion process

Gnaoui, Yasser El; Karouach, Fadoua; Bakraoui, Mohammed; Barz, Mirko; Bari, Hassan El

doi:10.1016/j.egyr.2019.11.096

Cited by 54 publications

(25 citation statements)

References 11 publications

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“…Similar results were also obtained by Naran et al [44], who reported that pretreatment of food waste at 120 °C with a 60min duration in an autoclave showed improved methane production in the range of 32% compared to untreated food waste. In a study demonstrated by Gnaoui et al [38], pretreatment of food waste at 100 °C for 30 min showed an increase in methane yield by 23.7% from pretreated compared to untreated food waste. The results from the previous studies indicated that pretreatment improves the methane yield as the pretreatment deflocculates the molecules, by this surface area increases and contact between microorganism and organic matter also increases resulting in higher methane generation [38].…”

Section: Methane Yield and Volatile Solids Reductionmentioning

confidence: 94%

“…In a study demonstrated by Gnaoui et al [38], pretreatment of food waste at 100 °C for 30 min showed an increase in methane yield by 23.7% from pretreated compared to untreated food waste. The results from the previous studies indicated that pretreatment improves the methane yield as the pretreatment deflocculates the molecules, by this surface area increases and contact between microorganism and organic matter also increases resulting in higher methane generation [38]. The results obtained in the present work are also in agreement with the previous results.…”

Section: Methane Yield and Volatile Solids Reductionmentioning

confidence: 94%

“…However, in the phases, a soluble COD of 85 ± 0.1 g/L was recorded even at a pressure of 2.5 kg/cm 2 , when the duration of the pretreatment is 100 min. The solubilization to the extent of 71% could be attributed to the fact that macro molecules are getting liquefied and released to the solution and hence soluble COD is getting increased due to pressurized pretreatment [38]. The huge difference in the soluble COD is due to the release of organic macromolecules in to the liquid form due to pressurized pretreatment [38].…”

Section: Effect Of Pressurized Pretreatment On Physio Chemical Characteristics Of the Food Wastementioning

confidence: 99%

“…The solubilization to the extent of 71% could be attributed to the fact that macro molecules are getting liquefied and released to the solution and hence soluble COD is getting increased due to pressurized pretreatment [38]. The huge difference in the soluble COD is due to the release of organic macromolecules in to the liquid form due to pressurized pretreatment [38]. In this context, it is worthwhile to examine, whether soluble COD that is increased due to pretreatment would be available to the microbial consortia to yield higher methane and carbon removal.…”

Section: Effect Of Pressurized Pretreatment On Physio Chemical Characteristics Of the Food Wastementioning

confidence: 99%

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Significance of Pretreatment in Enhancing the Performance of Dry Anaerobic Digestion of Food Waste: An Insight on Full Scale Implementation Strategy with Theoretical Analogy

et al. 2020

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The aim of this study was to treat food waste containing 25% total solids (TS) through dry anaerobic digestion (dry AD) process at various pressures (0.5 to 2.5 kg/cm2) and different time duration (20 to 100 min) to understand the impact of pretreatment in enhancing the methane generation potential along with insights on scale up. The findings revealed that vs. reduction and methane yield of 60% and 0.25 L CH4/(g VSadded) can be achieved with pretreated food waste at two kilograms per square centimeter, while pretreatment of food waste at 2 kg/cm2 for 100 min enhanced the vs. reduction from 60% to 85% and methane yield from 0.25 to 0.368 L CH4/(g VSadded). However, the net energy indicated that 40 min of pre -treatment at two kilograms per square centimeter can be a suitable option as methane yield and vs. reduction of 0.272 L CH4/(g VSadded) and 70%, respectively was achieved. The vs. reduction and the methane yield of 45% and 0.14 L CH4/(g VSadded), respectively was obtained from untreated food waste which illustrated that pretreatment had significantly impacted on the enhancement of methane generation and organic matter removal which can make the dry AD process more attractive and feasible at commercial scale.

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Section: Methane Yield and Volatile Solids Reductionmentioning

confidence: 94%

Section: Methane Yield and Volatile Solids Reductionmentioning

confidence: 94%

Section: Effect Of Pressurized Pretreatment On Physio Chemical Characteristics Of the Food Wastementioning

confidence: 99%

Section: Effect Of Pressurized Pretreatment On Physio Chemical Characteristics Of the Food Wastementioning

confidence: 99%

See 2 more Smart Citations

Significance of Pretreatment in Enhancing the Performance of Dry Anaerobic Digestion of Food Waste: An Insight on Full Scale Implementation Strategy with Theoretical Analogy

et al. 2020

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“…Organic waste can be utilised in anaerobic digestion (AD) to generate electricity and produce other useful digestate products [1]. Anaerobic digestion refers to the natural biodegradation of organic matter with the aid of microorganisms in anoxic conditions [13]. Some examples of these microorganisms are Bacillus, Acetivibrio, Clostridia and Methanobacterium ( Figure 2).…”

Section: Anaerobic Digestionmentioning

confidence: 99%

The Current Status, Potential Benefits and Future Prospects of the Australian Biogas Sector

Ngo¹,

Ball²,

Shahsavari³

2021

JSBS

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Anaerobic digestion technology provides a new approach to treat organic waste while generating greenhouse gas (GHG) savings. Moreover, the methane gas produced during the process can be used to generate electricity. In order to ensure that Australia stays on its trajectory towards a carbon neutral future, the use of anaerobic digestion technology to treat its abundant organic waste streams should be considered. Thirty million tonnes (Mt) of organic waste was produced in 2017. The use of anaerobic digestion to treat 1 tonne of waste could result in 0.143 tonne of CO 2-e in GHG savings. In contrast, other more widely employed waste disposal methods such as landfilling, composting and incineration may generate GHG emissions. Additionally, the use of methane for electricity production also generates the least GHG emissions per MWh. This is approximately 3 times lower than crude oil, 4 times lower than black coal and 5 times lower than brown coal. However, the adoption and implementation of anaerobic digestion technology in Australia face several immediate constraints. Firstly, anaerobic digestion technology is deemed unprofitable, incurring high initial capital cost, operating costs and extremely long payback periods. Secondly, there is a lack of government support in terms of a national target for biogas production via anaerobic digestion. This review will provide an in-depth analysis into the current state of the Australian biogas sector. In addition, the review discusses the opportunities to make anaerobic digestion technology more financially viable and to accelerate the growth of the Australian biogas sector.

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Determination of the biochemical methane potential of food waste after aerobic storage and aeration pretreatment

Oliveira

Léo

Forster‐Carneiro³

et al. 2022

Biofuels Bioprod Bioref

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Food waste represents a relevant fraction of municipal solid organic waste, and anaerobic digestion can be an eco-friendly alternative for sustainable management in a circular economy framework. One of the challenges to the implementation of anaerobic digestion is the availability of easily degradable compounds in the substrate, which can be solved by the application of pretreatment to increase methane production. In this study, the influence of aerobic storage time and forced continuous aeration pretreatment on the biochemical methane potential of food waste was evaluated. The results demonstrate an increase in the methane production concerning the total volatile solids (TVS) of food waste stored for 7 days (425 NmL CH 4 g −1 TVS) compared with fresh samples without pretreatment (375 NmL CH 4 g −1 TVS). The adoption of forced and continuous aeration pretreatment on food waste for 4 days produced 456 NmL CH 4 g −1 TVS for the leachate, 1.22-fold higher than that for the food waste without storage. In conclusion, the application of aeration pretreatment previous to anaerobic digestion can be an alternative to increase the methane potential from food waste.

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Mesophilic anaerobic digestion of food waste: Effect of thermal pretreatment on improvement of anaerobic digestion process

Cited by 54 publications

References 11 publications

Significance of Pretreatment in Enhancing the Performance of Dry Anaerobic Digestion of Food Waste: An Insight on Full Scale Implementation Strategy with Theoretical Analogy

Significance of Pretreatment in Enhancing the Performance of Dry Anaerobic Digestion of Food Waste: An Insight on Full Scale Implementation Strategy with Theoretical Analogy

The Current Status, Potential Benefits and Future Prospects of the Australian Biogas Sector

Determination of the biochemical methane potential of food waste after aerobic storage and aeration pretreatment

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